The xiè reading lives in exactly one word:
写意 meaning 'comfortable, leisurely, easy-going'. Don't confuse it with the SAME written form
写意 (rising tone) — that's the celebrated 'freehand style' of Chinese painting and ink-art criticism. Different reading, different meaning, identical characters. Context picks: if you can swap in 'comfortable / relaxed', read xiè; if it's about brush technique or evoking spirit over detail, read xiě.